1 /* 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_BUF_ITEM_H__ 19 #define __XFS_BUF_ITEM_H__ 20 21 extern kmem_zone_t *xfs_buf_item_zone; 22 23 /* 24 * This flag indicates that the buffer contains on disk inodes 25 * and requires special recovery handling. 26 */ 27 #define XFS_BLF_INODE_BUF (1<<0) 28 /* 29 * This flag indicates that the buffer should not be replayed 30 * during recovery because its blocks are being freed. 31 */ 32 #define XFS_BLF_CANCEL (1<<1) 33 34 /* 35 * This flag indicates that the buffer contains on disk 36 * user or group dquots and may require special recovery handling. 37 */ 38 #define XFS_BLF_UDQUOT_BUF (1<<2) 39 #define XFS_BLF_PDQUOT_BUF (1<<3) 40 #define XFS_BLF_GDQUOT_BUF (1<<4) 41 42 #define XFS_BLF_CHUNK 128 43 #define XFS_BLF_SHIFT 7 44 #define BIT_TO_WORD_SHIFT 5 45 #define NBWORD (NBBY * sizeof(unsigned int)) 46 47 /* 48 * This is the structure used to lay out a buf log item in the 49 * log. The data map describes which 128 byte chunks of the buffer 50 * have been logged. 51 */ 52 #define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD) 53 54 typedef struct xfs_buf_log_format { 55 unsigned short blf_type; /* buf log item type indicator */ 56 unsigned short blf_size; /* size of this item */ 57 ushort blf_flags; /* misc state */ 58 ushort blf_len; /* number of blocks in this buf */ 59 __int64_t blf_blkno; /* starting blkno of this buf */ 60 unsigned int blf_map_size; /* used size of data bitmap in words */ 61 unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */ 62 } xfs_buf_log_format_t; 63 64 /* 65 * All buffers now need to tell recovery where the magic number 66 * is so that it can verify and calculate the CRCs on the buffer correctly 67 * once the changes have been replayed into the buffer. 68 * 69 * The type value is held in the upper 5 bits of the blf_flags field, which is 70 * an unsigned 16 bit field. Hence we need to shift it 11 bits up and down. 71 */ 72 #define XFS_BLFT_BITS 5 73 #define XFS_BLFT_SHIFT 11 74 #define XFS_BLFT_MASK (((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT) 75 76 enum xfs_blft { 77 XFS_BLFT_UNKNOWN_BUF = 0, 78 XFS_BLFT_UDQUOT_BUF, 79 XFS_BLFT_PDQUOT_BUF, 80 XFS_BLFT_GDQUOT_BUF, 81 XFS_BLFT_BTREE_BUF, 82 XFS_BLFT_AGF_BUF, 83 XFS_BLFT_AGFL_BUF, 84 XFS_BLFT_AGI_BUF, 85 XFS_BLFT_DINO_BUF, 86 XFS_BLFT_SYMLINK_BUF, 87 XFS_BLFT_DIR_BLOCK_BUF, 88 XFS_BLFT_DIR_DATA_BUF, 89 XFS_BLFT_DIR_FREE_BUF, 90 XFS_BLFT_DIR_LEAF1_BUF, 91 XFS_BLFT_DIR_LEAFN_BUF, 92 XFS_BLFT_DA_NODE_BUF, 93 XFS_BLFT_ATTR_LEAF_BUF, 94 XFS_BLFT_ATTR_RMT_BUF, 95 XFS_BLFT_SB_BUF, 96 XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS), 97 }; 98 99 static inline void 100 xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type) 101 { 102 ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF); 103 blf->blf_flags &= ~XFS_BLFT_MASK; 104 blf->blf_flags |= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK); 105 } 106 107 static inline __uint16_t 108 xfs_blft_from_flags(struct xfs_buf_log_format *blf) 109 { 110 return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT; 111 } 112 113 /* 114 * buf log item flags 115 */ 116 #define XFS_BLI_HOLD 0x01 117 #define XFS_BLI_DIRTY 0x02 118 #define XFS_BLI_STALE 0x04 119 #define XFS_BLI_LOGGED 0x08 120 #define XFS_BLI_INODE_ALLOC_BUF 0x10 121 #define XFS_BLI_STALE_INODE 0x20 122 #define XFS_BLI_INODE_BUF 0x40 123 #define XFS_BLI_ORDERED 0x80 124 125 #define XFS_BLI_FLAGS \ 126 { XFS_BLI_HOLD, "HOLD" }, \ 127 { XFS_BLI_DIRTY, "DIRTY" }, \ 128 { XFS_BLI_STALE, "STALE" }, \ 129 { XFS_BLI_LOGGED, "LOGGED" }, \ 130 { XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \ 131 { XFS_BLI_STALE_INODE, "STALE_INODE" }, \ 132 { XFS_BLI_INODE_BUF, "INODE_BUF" }, \ 133 { XFS_BLI_ORDERED, "ORDERED" } 134 135 136 #ifdef __KERNEL__ 137 138 struct xfs_buf; 139 struct xfs_mount; 140 struct xfs_buf_log_item; 141 142 /* 143 * This is the in core log item structure used to track information 144 * needed to log buffers. It tracks how many times the lock has been 145 * locked, and which 128 byte chunks of the buffer are dirty. 146 */ 147 typedef struct xfs_buf_log_item { 148 xfs_log_item_t bli_item; /* common item structure */ 149 struct xfs_buf *bli_buf; /* real buffer pointer */ 150 unsigned int bli_flags; /* misc flags */ 151 unsigned int bli_recur; /* lock recursion count */ 152 atomic_t bli_refcount; /* cnt of tp refs */ 153 int bli_format_count; /* count of headers */ 154 struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */ 155 struct xfs_buf_log_format __bli_format; /* embedded in-log header */ 156 } xfs_buf_log_item_t; 157 158 void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *); 159 void xfs_buf_item_relse(struct xfs_buf *); 160 void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint); 161 uint xfs_buf_item_dirty(xfs_buf_log_item_t *); 162 void xfs_buf_attach_iodone(struct xfs_buf *, 163 void(*)(struct xfs_buf *, xfs_log_item_t *), 164 xfs_log_item_t *); 165 void xfs_buf_iodone_callbacks(struct xfs_buf *); 166 void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *); 167 168 void xfs_trans_buf_set_type(struct xfs_trans *, struct xfs_buf *, 169 enum xfs_blft); 170 void xfs_trans_buf_copy_type(struct xfs_buf *dst_bp, struct xfs_buf *src_bp); 171 172 #endif /* __KERNEL__ */ 173 174 #endif /* __XFS_BUF_ITEM_H__ */ 175